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6th grade Science test

What does a paleontologist study?

fossils

_____________________ is used to determine the age of a rock layer.

absolute age

The preserved remains of trace fossils is called an _______________________fossils.

index

Foot prints and trails are examples of _________________________________fossils.

trace

What is a petrified fossil?

a fossil formed when minerals replace all or part of an organism

What does uniformitarianism mean?

processes that continue to reshape the earth

What does catastrophism mean?

all geologic change occurs suddenly

What is the absolute age of a rock? What is your absolute age?

the exact age

What is the relative age of a rock? What is your relative age (compare to a sibling)?

whether the rock is younger or older

What do scientists need to know in order to find the absolute age of a rock?

the relative age of the rock

Which method of radiometric dating was used to determine the age of the Earth?

the geologic time scale

The _______________________ states that the youngest rock layers are at the top of the oldest rock layers are at the bottom. This helps determine the ______________ of the ages of the rock.

law of superposition; absolute age

What is an unconformity? Give four examples.

erosion has caused an older rock layer to be exposed, and then a newer rock layer forms on top of it. examples: erosion, non-deposition, non-conformity and disconformity

The ______________________ shows how life has changed on Earth, as well as the major events in Earth's history?

geologic time scale

_____________________ describes the process of how living things on Earth have changed over long period of time.

fossil record

A Dodo bird is ____________________ because it no longer exists on Earth.

extinct

What are the three ERAS that geologic time is divided into?

Paleozoic, Mesozoic, Cenozoic

What ERA are we currently in?

Cenozoic

What is the name of the large landmass (supercontinent) that existed more than 250 million years ago? ___________________________

Pangaea

What do scientists think may have caused dinosaurs to become extinct?

a meteorite hit earth and the climate changed

Approximately how old is the Earth?

4.6 billion years old

What have scientist learned by studying Earth's fossil record?

the history of life on earth

What type of condition slow down an organisms decay?

freezing temperature

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